1 files changed, 43 insertions, 0 deletions
diff --git a/share/scripts/s_plugin_automation.lua b/share/scripts/s_plugin_automation.lua
new file mode 100644
index 0000000000..2b04bae638
--- /dev/null
+++ b/share/scripts/s_plugin_automation.lua
@@ -0,0 +1,43 @@
+ardour { ["type"] = "Snippet", name = "Plugin automation" }
+
+function factory () return function ()
+	-- query playhead position and session sample-rate
+	local playhead = Session:transport_sample ()
+	local samplerate = Session:nominal_sample_rate ()
+
+	-- get Track/Bus with RID 3
+	local r = Session:get_remote_nth_route(3)
+	-- make sure the track object exists
+	assert (not r:isnil ())
+
+	-- get AutomationList, ControlList and ParameterDescriptor
+	-- of the first plugin's first parameter
+	-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI
+	local al, cl, pd = ARDOUR.LuaAPI.plugin_automation (r:nth_plugin (0), 0)
+
+	if not al:isnil () then
+		print ("Parameter Range", pd.lower, pd.upper)
+		print ("Current value", cl:eval (playhead))
+
+		-- prepare undo operation
+		Session:begin_reversible_command ("Automatix")
+		-- remember current AutomationList state
+		local before = al:get_state()
+
+		-- remove future automation
+		cl:truncate_end (playhead)
+
+		-- add new data points after the playhead 1 sec, min..max
+		-- without guard-points, but with initial (..., false, true)
+		for i=0,10 do
+			cl:add (playhead + i * samplerate / 10,
+				 pd.lower + math.sqrt (i / 10) * (pd.upper - pd.lower),
+				 false, true)
+		end
+
+		-- save undo
+		local after = al:get_state()
+		Session:add_command (al:memento_command(before, after))
+		Session:commit_reversible_command (nil)
+	end
+end end